#include <stdio.h>
#include <unistd.h>
int gval = 100;
int main()
{
  pid_t id = fork();
  if(id == 0)
  {
    while(1)
    {
      printf("子:gval:%d,&gval:%p,pid:%d,ppid:%d\n",gval,&gval,getgid(),getppid());
      sleep(1);
      gval++;
    }
  }
  else
  {
    while(1)
    {
      printf("父:gval,%d,&gval:%p,pid:%d,ppid:%d\n",gval,&gval,getpid(),getppid());
      sleep(1);
    }
  }
}
